# All files / src/utils audio.ts

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100% Branches 12/12
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     import fs from "fs";
    import path from "path";

    export interface AudioFileData {
      data: Uint8Array;
      fileName: string;
      duration?: number;
    }

    export class AudioUtils {
      static async load(filePath: string): Promise<AudioFileData> {
        let data: Uint8Array;
        let fileName: string;

        if (filePath.startsWith("http")) {
          const response = await fetch(filePath);
          if (!response.ok) {
            throw new Error(`Failed to fetch remote audio file: ${response.statusText}`);
          }
          const arrayBuffer = await response.arrayBuffer();
          data = new Uint8Array(arrayBuffer);
          const urlPath = new URL(filePath).pathname;
          fileName = path.basename(urlPath) || "audio.mp3";
        } else {
          const buffer = await fs.promises.readFile(filePath);
          data = new Uint8Array(buffer);
          fileName = path.basename(filePath);
        }

        const duration = this.estimateDuration(data, fileName);
        return { data, fileName, duration };
      }

      static estimateDuration(data: Uint8Array, fileName: string): number | undefined {
        try {
          const ext = path.extname(fileName).toLowerCase();
          if (ext === ".wav") {
            // Simple WAV duration: (DataSize / ByteRate)
            const view = new DataView(data.buffer, data.byteOffset, data.length);
            const byteRate = view.getUint32(28, true);
            const dataSize = view.getUint32(40, true);
            if (byteRate > 0) return dataSize / byteRate;
          } else if (ext === ".mp3") {
            // Very rough MP3 estimate (assume 128kbps)
            return data.length / (128000 / 8);
          }
        } catch {
          // Ignore estimation errors
        }
        return undefined;
      }
    }